akr	2009-02-25 02:18:55 +0900 (Wed, 25 Feb 2009)

  New Revision: 22607

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=22607

  Log:
    rdoc update.

  Modified files:
    trunk/file.c

Index: file.c
===================================================================
--- file.c	(revision 22606)
+++ file.c	(revision 22607)
@@ -3499,15 +3499,18 @@
  *
  *  Example:
  *
- *     # write lock
+ *     # update a counter using write lock
  *     # don't use "w" because it truncates the file before lock.
- *     File.open("testfile", File::WRONLY|File::CREAT, 0644) {|f|
+ *     File.open("counter", File::RDWR|File::CREAT, 0644) {|f|
  *       f.flock(File::LOCK_EX)
- *       f.truncate(0)
- *       f.write "new content"
+ *       value = f.read.to_i + 1
+ *       f.rewind
+ *       f.write("#{value}\n")
+ *       f.flush
+ *       f.truncate(f.pos)
  *     }
  *
- *     # read lock
+ *     # read the counter using read lock
  *     File.open("testfile", "r") {|f|
  *       f.flock(File::LOCK_SH)
  *       p f.read

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